Asia & Oceania · Japan
Helical Fusion
Magnetic confinement — heliotron stellarator
Magnetic
Deuterium-Tritium
Undisclosed
TBD
Investor brief
Heliotron stellarators with liquid-metal blankets
Executive Summary
Helical Fusion is a National Institute for Fusion Science spin-out building on the LHD (Large Helical Device) heliotron lineage — a continuously operating helical stellarator with liquid-metal blanket. LHD has already operated for thousands of hours, making it arguably the most operationally proven stellarator class.
Strategic Thesis
LHD has already operated for thousands of hours; commercialise the world's most operationally proven stellarator class.
The Problem
Global electricity demand is entering an unprecedented growth phase driven by AI infrastructure, data centers, transport electrification, industrial decarbonization, water desalination, and advanced manufacturing. Solar suffers intermittency, wind capacity-factor variability, natural gas carbon emissions, conventional nuclear cost and deployment speed, and batteries energy-density and duration limits. The world requires a new source of clean, dispatchable baseload energy. Fusion represents the ultimate energy source — the challenge is making it commercially practical.
Helix-1 — Commercial Heliotron
Heliotrons use continuous helical coils rather than discrete modular ones, simplifying coil manufacture relative to modern optimized stellarators while still delivering steady-state operation.
LHD Heritage
Direct continuity with the LHD, the world's largest superconducting helical device.
Liquid-Metal Blanket
Flowing liquid metal serves as the first wall and tritium breeder.
Helix-1 Demonstrator
Commercial-track heliotron demonstrator design.
Fuel Strategy
Deuterium-Tritium
Standard D-T fuel cycle with liquid-metal blanket breeding.
Product Platform
Helix-1
Commercial heliotron demonstrator design.
Energy Conversion
Thermal (Rankine/Brayton)
Neutronic (D-T)
33–40% electrical
Deuterium-tritium fusion releases ~80% of its energy as 14.1 MeV neutrons, which deposit their kinetic energy in a surrounding blanket. The heat drives a conventional steam (Rankine) or supercritical-CO₂ (Brayton) turbine.
Conversion chain
- 1D-T plasma
- 214.1 MeV neutrons (80%) + 3.5 MeV alpha (20%)
- 3Neutrons → lithium-bearing blanket (heat + tritium breeding)
- 4Heat → steam/CO₂ turbine → electricity
The most thoroughly understood fusion fuel cycle, highest cross-section at achievable temperatures, and proven back-end engineering (steam turbines are 19th-century technology). Trade-offs: neutron-induced materials damage, tritium handling, ~33–40% Carnot-limited efficiency.
Economic Vision
Leveraging LHD's thousands of operating hours sharply lowers physics risk relative to first-of-a-kind stellarator concepts.
Vision
Commercialise the world's most operationally proven stellarator class.
Mission
Build the first commercial heliotron power plant.
Engineering Bottlenecks
- Liquid-metal blanket scaling
- Heliotron compactness vs. classical tokamaks
The description above reflects Helical Fusion's publicly stated technology goals, roadmap and architecture. Many elements — particularly net-energy gain at scale, advanced fuel cycles, and grid-relevant economics — remain ambitious objectives that have not yet been demonstrated commercially anywhere in the fusion industry. Forward-looking statements should be treated as engineering targets, not certainties.
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Citations & Sources
Academic & financial rigor- [01]
The Global Fusion Industry in 2025
Fusion Industry Association · Jul 2025
- [02]
Company disclosures and press releases
Helical Fusion
- [03]
Peer-reviewed plasma physics literature
Journal of Plasma Physics / Nuclear Fusion